Refrigerating apparatus



Sept. 22, 1936. J. KARMAZIN REFRIGERATING APPARATUS Filed May 7, 1935INVENTOR. 75/ K 11K myzu/ the general type illustrated in the patent toPatented Sept. 2 2, 1936 ao ssaoof nnr'nrdnnamdfnrrannrns John Karmazin,Huntington, a

Karmazin E ineering tion of Michigan m any. eco -nora- I Applicationnew, 1935, semi No. 20,208

This invention relates to refrigerating apparatus and more particularlyto a heat exchange structure for use in refrigerating apparatus and forother purposes.

In constructing heat exchangers of size for use in refrigeratingapparatus and for other I uses where large and rapid temperature changesoccur, and particularly heat exchange devices of Karmazin 1,997,563issued April 9, 1935, considerable 'dimculty has been experienced inpreventing breakage of the heat exchange core under the stresses inducedby unequal expansion between the heat exchange core and the supportstherefor. Particular in the larger sizes of heat exchangers, thesupports must be of rugged construction due to the weight of the heatexchange device and very often are made of material having a differentcoefllcient of expansion from the material of the heat exchange core. Inaddition, the supporting means being of more concentrated mass than theelements of the heat exchange core is, therefore, slower in respondingto the temperature changes of the fluid flowing through the heatexchange device than is the material of the core. These factors produceunequal expansion' between the core andthe supports which inconstructions heretofore devised have often caused failure of the heatexchange core.

- It is an object of the present invention to provide a heat exchangedevice which may be constructed in large sizes and in which thesupporting means therefor and the construction of the heat exchangedevice itself are so correlated as v to minimize stresses produced underunequal expansions of the core and the support.

in Fig. 1. I g

'Generally speaking, these objects are accom. plished in the presentinvention by dividing the core into a plurality of sections embracing asmall number of rows of parallel tubes. The

Fiu'ther objects andadvantages of the present; invention will beapparent from the following description, reference being had to theaccompanylng drawing, wherein a preferred form of the present inventionis clearly shown.

In the drawing:

Fig. 1 is a side view of the heat exchange defvlce embodying the presentinvention;

.Fig. 2 is a top view partly in section of the device illustrated inFig. 1; and

Fig. 3 is an end view of the device illustrated sections are connectedto each other only through a small flexible tubing connection, while thesup ports are fastened to the core in a manner to. Q

provide a large lever arm through which the expansion forces aretransmitted between the support and the In the construction illustratedin the drawing, 5 a heat exchange" core III is provided which is dividedinto a plurality of sections, l2, l4 and I6. Each section is formed froma plurality of flat parallel fins I! having integraltapered tubularprojections formed therein. Thepro- 10 jections of adjacent tubes aretelescoped together to provide a plurality of rows of parellel tubes 22.The tubes of eachrow are connected for series flow circuit relation by aplurality of header means 24 having tapered tubular projections 25,15

. tubes in section I 2 is connected with the end 20 tube of the top rowin section I by 'a return bend to which is formed from a bent tube in amanner to provide a slight degree of flexibility.

A similar return bend 32 connects one tube of each of the sections l4and I. Inlet and outlet oonnectio 34 are provided to connect with onetube of each of the sections i2 and respectively. Thus, a series flowcircuit is established 7 through each tube of the entire heat exchangestructure. I

The supporting means for the heat exchange structure comprises a set ofsupporting plates 36, two of which are provided at either end of thedevice. The plates 36 are attachedto the heat exchange structure bystuds 38 which are secured to the header means 2, as by welding, andwhich may also be welded tothe plates 36.

In operation of the device .whenever difl'erences in expansion betweenthe core l0 and the 40 supporting plates 2' occur, the stresses arerelieved between each of the sections l2, l4 and Itby the flexiblereturn bends 30 and 32. The stress transmitted to the core is therebyreduced sincethe total. expansion difierence eflective on any section ofthe core is limited to thatwhich may take place in the short section ofthe plates 36 which connects between the two. header means "24, of eachsection. This limited stress is furi8 is very greatly reduced,

A scope of the claims which follow.

What is claimed is as follows:

1. A heat exchange device comprising a plurality of sections, eachsection including a plurality of rows of parallel tubes and a pluralityof transverse fins connecting the tubes and the rows of tubes, headermeans connecting the ends of adjacent tubes in each row, means forming aconnection between adjacent rows of tubes, flexible conduit meansbetween tubes of arfiacent sections, and supporting means for joiningthe sections together, said supporting means being attached to saidheader means to provide a slightly flexible connection between theheader means of a. section whereby conditions of unequal expansion arecompensated by flexure of the flexible conduit means between adjacentsections and by fiexure of the supporting means between adjacent rows ofone section.

2. A heat exchange device comprising a plurality of sections, eachsection including a plurality of rows of parallel tubes secured inrelatively rigid relationship, header means connecting the ends ofadjacent tubes in each section, a single flexible conduit betweenadjacent sections, and supporting means for joining the sectionstogether, said supporting means being attached to said header means toprovide a slightly flexible connection between the header means of asection whereby conditions of unequal expansion are compensated byfiexure of the flexible conduit between adjacent sections and by flexureof the supporting means between adjacent rows of one section.

JOHN KARMAZIN.

